Question

我正在尝试运行下面的脚本但是收到错误...

Msg 306，Level 16，State 2，Line 58
除非使用IS NULL或LIKE运算符，否则无法比较或排序text，ntext和image数据类型。

有人能告诉我哪里出错了。请温柔，因为我对这一切都是新手。：）

提前致谢！

SELECT
   c.address_number as address_number,
   c.contact_number as contact_number,
   c.label_name as contact_name,
   a.address as address,
   a.postcode as postcode,
   s.source as source,
   s.source_desc as source_desc,
   m.joined as member_join_date,
   m.membership_card_expires as member_expiry_date,
   o.payment_method as payment_method,
   pf.payment_frequency_desc as payment_frequency_desc,
   pf.frequency as payment_frequency,
   c.std_code as std_code,
   c.telephone as phone_number,
   gift_aid = CASE
                WHEN gad.declaration_number IS NOT NULL then 'Y' else null end,
   cp.first_payment_date as first_payment_date,
   cp.last_payment_date as last_payment_date,
   -- NUMBER OF DONATIONS IN THE LAST 12 MONTHS GOES HERE --
   cp.value_of_payments as total_donation_amount
FROM
   contacts c
INNER JOIN 
   contact_addresses ca ON c.contact_number = ca.contact_number 
                        AND c.address_number = ca.address_number
INNER JOIN 
   addresses a ON ca.address_number = a.address_number 
INNER JOIN 
   sources s ON c.source = s.source
INNER JOIN 
   contact_suppressions cs ON c.contact_number = cs.contact_number
INNER JOIN 
   orders o ON c.contact_number = o.contact_number
INNER JOIN 
   members m ON c.contact_number = m.contact_number
INNER JOIN 
   contact_categories cc ON c.contact_number = cc.contact_number
INNER JOIN 
   payment_frequencies pf ON o.payment_frequency = pf.payment_frequency
LEFT OUTER JOIN 
   gift_aid_declarations gad ON c.contact_number = gad.contact_number 
                             AND (start_date IS NULL OR start_date < GETDATE())
INNER JOIN 
   contact_performances cp ON c.contact_number = cp.contact_number
WHERE
   -- EXCLUSIONS --
   c.status NOT IN ('DECD','AN','DU','GONE') AND
   c.contact_number NOT IN (SELECT contact_number FROM contact_suppressions 
                            WHERE mailing_suppression IN ('NOMA','APP','DATA')) AND
   c.contact_number NOT IN (SELECT contact_number FROM contact_categories 
                            WHERE activity IN ('MAJDON', 'PATRON', 'PCD11', 'PCT', 
                                               'PCAD12', 'PCAD13', 'PCFI13', 
                                               'PCHR12', 'PCIA12', 'PCNH12',
                                               'PCSL13', 'PCSK13', 'PCTC13')) AND 
   ca.historical = 'N' AND
   -- MEMEBRSHIP NOT CANCELLED --
   m.cancellation_reason IS NULL
ORDER BY
    address_number, contact_number, contact_name, address, postcode, source, source_desc, member_join_date,
member_expiry_date, payment_method, payment_frequency_desc, payment_frequency, std_code, phone_number, gift_aid,      first_payment_date, last_payment_date, total_donation_amount

Answer 1

您需要弄清楚您正在使用的列是text，ntext或image数据类型列。根据错误消息，您使用此数据类型的列进行排序或＆＃34;比较＆＃34;。在此查询中，该查询位于WHERE子句，联接的ON子句，ORDER BY子句，ORDER BY子句或可能在该CASE语句中。

完全根据colunn名称，我猜测它是source或gift_aid，但如果不审查架构则无法确定。

Answer 2

错误表示第58行是“Cancellation_reason IS NULL”

也许您可以应用LEFT（）来获取字符串，然后将其测试为null，例如

LEFT( m.cancellation_reason, 1 ) IS NULL

所以在这里，我只关心取消原因的第一个字符。如果它为null，它不会返回null吗？

不确定如何解决SQL错误

2 个答案: